MUSCLES AND TENDONS. A transmission electron micrograph showing a longitudinal section of cardiac (heart) muscle, in which the sarcomere structure and.

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Presentation on theme: "MUSCLES AND TENDONS. A transmission electron micrograph showing a longitudinal section of cardiac (heart) muscle, in which the sarcomere structure and."— Presentation transcript:

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MUSCLES AND TENDONS

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A transmission electron micrograph showing a longitudinal section of cardiac (heart) muscle, in which the sarcomere structure and a large intercalated disc can be seen. Credit: Professor Giorgio Gabella, Wellcome Images Cardiac muscle

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A colour-enhanced transmission electron micrograph of myofibrils in an uncontracted skeletal muscle cell (muscle fibre), showing the structure of the sarcomere with its dark and light bands between the two Z-discs. Credit: University of Edinburgh, Wellcome Images BIGPICTUREEDUCATION.COM Relaxed skeletal muscle

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A transmission electron micrograph showing glycogen storage in a muscle cell. Some glycogen granules are dispersed around the many mitochondria in between the contractile myofibrils, but most of the glycogen is in a large area at the edge of the cell. Credit: Mike Kayser, Wellcome Images BIGPICTUREEDUCATION.COM Glycogen stored in muscle

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Galvani’s experiments on the sciatic nerve of frogs. This was the first detection of galvanic currents. From ‘Memorie sulla elettricita animale’ by Luigi Galvani (Bologna, 1797). Credit: Wellcome Library, London BIGPICTUREEDUCATION.COM Historical experiments on frog nerves

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A confocal image showing damaged collagen fibres in a ruptured tendon. The area of wavy fibres to the lower right shows the normal, healthy appearance of a tendon. The waviness allows the whole tendon to have a small amount of elasticity (between 2 and 10 per cent); the collagen fibres themselves do not stretch. Credit: Martin Knight, Wellcome Images BIGPICTUREEDUCATION.COM Ruptured tendon